Appa, Steadfast Guardian + Icewind Stalwart + Grand Arbiter Augustin IV + Stormscape Familiar

Decks

How it works

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Cast Appa by paying
When Appa enters, its first ability triggers, exiling Icewind Stalwart with the ability to cast it later from exile.
Cast Icewind Stalwart from exile by paying .
Appa's second ability triggers, creating a 1/1 Ally creature token
When Icewind Stalwart enters, it triggers, blinking Appa.
Repeat from step 2.

In which brackets is this combo allowed, per Spellbook's Powerful tier?

1–2 · Exhibition & Core

Spellbook classifies this as Powerful — not for these brackets.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.